Mumia Abu-Jamal (Wikipedia) is a guy who is famous for being in the Black Panther Party, and also famous for being in prison. Some people don't like the prison part.

He's probably never been to Davis, but here's a list of all things in Davis related to Mumia Abu-Jamal:

September 15, 2007: A poster with a picture of Mumia as well as information regarding his case and what people can do to get more informed and resources available to support him was seen at the Delta of Venus in what use to be a Phonebooth.

May 11, 2000: Mumia Abu-Jamal, A Case for Reasonable Doubt (HBO Documentary Film). An opportunity to "learn about Mumia Abu-Jamal, an African-American journalist and community activist currently on Pennsylvania's death row." There was also a discussion regarding the implications of Mumia's case and what people can do.